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The lens in the adult human eye blocks nearly 100 percent of the sun's UV rays. As part of the normal aging process, the eye's natural lens eventually blocks some short-wavelength blue light as well â the type of blue light most likely to cause damage to the retina and lead to macular degeneration and vision loss.
Permanent damage to the eye can result from retinal damage. The retina is a tissue that lines the back of the eye and is responsible for capturing the image we see and sending it to the brain resulting in the perception of vision. If the retina is damaged, then permanent vision loss can result. So a laser can cause permanent vision loss if it damages the retina. In the United States, lasers are regulated by the Food and Drug Administration. Lasers typically have a warning label alerting the consumer to the danger.